Nozzle for the mouth of an air duct



United States Patent Svend Hel'ge Kristiansen lnventor N'aestved, Denmark Appl. No. 732,458 Filed May 27, 1968 Patented Nov. 24, 1970 Assignee Nordisk Ventilator Co. A/S

Naestved, Denmark Priority June 1, 1967 Denmark No; 2882/67 NOZZLE FOR THE MOUTH OF AN AIR DUCT 3 Claims, 2 Drawing Figs.

US. Cl 98/40, 98/114,251/212 Int. Cl F241 13/06 Field of Search 98/41, 40(D),

[56] References Cited UNITED STATES PATENTS 543,182 7/1895 Hunt 25 l/2l2X 1,612,590 12/1926 Lucka et a1. 251/212X 3,396,675 8/1968 Stevens 251/212X 1,607,092 11/1962 Lyon r 98/37 3,381,600 5/1968 Getzin r 98/40 3,389,649 6/1968 Larkfeldt et al. 98/41 Primary Examiner-William E. Wayner Attorney -Sughrue, Rothwell, Mion, Zinn and Macpeak ABSTRACT: A mouthpiece for an air injection channel for ventilation purposes comprising two parts each made of a plate bent into a U-shape, the lateral parts thereof being shaped as circular sections, the two parts'being pivotably mounted with a common axis through points approximately in the centers of the circular sections. The two parts form a tubular structure and are mutually independently adjustable over a range of angular positions so as to adjust both the mouth area and the axial direction of the mouthpiece as a whole.

lNVENT OR ATTORNEY NOZZLE FOR THE MOUTH OF AN AIR DUCT The invention relates to a nozzle for the mouth of an air duct comprising two movable parts.

Where an air duct terminates in a room to be ventilated, it is as a rule necessary to be able to throttle, and besides, it is often desirable to be able to adjust the direction of the discharge from the mouth.

As a rule, the throttling operation is performed by means of adjustable throttling members disposed in the vicinity of the mouth, while the adjustment of the direction of the discharge may for example be effected by means of a rotatable mouthpiece which can be adjusted in different directions.

The present invention aims at providing a nozzle of a very simple design, by means of which it is possible in a satisfactory way to perform the throttling operation as well as the adjustment of the direction of the discharge.

To this purpose each of the two nozzle parts has according to the invention the form of a piece of plate bent along two parallel lines, the portions of which plate located outside the two lines having substantially the shape of sectors of a circle and facing the same side of the portion located between the two lines, while the two parts are pivoted at two opposed lateral edges of a fixed nozzle portion of rectangular cross section with axes of rotation through the centres of their circular sector-shaped portions and with the said portions partially overlapping at both sides of each of the two parts, means being provided for securing the two parts in optional relative positions within an established range of variation.

lt will be obvious that the two parts together form a piece of tube of rectangular cross section. When the portions of the two parts located between the said parallel lines are parallel to each other, this piece of tube has a constant cross section corresponding to a maximum passage area, but when they are turned more or less towards each other, the cross section is narrowed and may be closed almost completely, so that any throttling desired may be achieved.

This does not affect the direction of discharge, as long as the degrees to which the two parts are turned towards each other are equal, so that they are still symmetrical in relation to a plane of symmetry through the mouth of the air duct.

If, on the other hand, the parts are turned to the same degree to the same side, so that they remain parallel, a variation in the direction of discharge will occur without any essential throttling, and by the parts being turned towards each other from such a position, a throttling is achieved at the changed direction of discharge.

Thus, it will be evident that within certain limits it is possible to carry out a mutually independent adjustment of the direction of discharge and the throttling by means of the same particularly simple elements.

The limits to the adjustability are first and foremost determined by it being impossible for one of the parts to be turned farther towards the other part than into the position where its portion located between the two parallel lines engages the circular sector-shaped portions on the other part, but it is possible without any difficulty whatever to achieve an adjustability of the direction of discharge of 30 to both sides, and this will, as a rule, be sufficient for practical purposes.

According to the invention, it may be advantageous that the sides of the fixed nozzle portion at right angles to the axes of rotation of the two parts are extended at any rate on their central parts, so that they project somewhat outside the circular bounds of the two parts, and that the means for determining the positions of the two parts are mounted on these outwardsprojecting parts in the form of gripping members engaging over the edges of the overlapping circular sector-shaped portions of both parts. Hereby the possibility of maintaining a certain adjusted position is achieved in a simple way.

In the following the invention will be further explained with reference to the drawing in which:

FIG. 1 shows a cross section through an embodiment of the nozzle according to the invention, and

FlG.'2 the same nozzle viewed in the axial direction from the inside.

In the embodiment shown in the drawing, the nozzle consists of a short rectangular tubelike piece 1 and two rotatable parts 2 and 3, each of which consists ofa piece of plate bent at right angles to the same side along two parallel lines, and where the portions 4 and 5 located outside these parallel lines are circular sector-shaped.

The two parts 2 and 3 are accomodated rotatable by means of rivets 6 at two opposed end edges of the tube piece 1 around shafts through the centres of the circular sectorshaped portions of each part 2 and in such a way that these portions on the two parts partially overlap.

When the two parts are turned into a position, in which their rectangular portions lie parallel to the axis for the tube piece 1, they thus together form a tube piece with a rectangular cross section of roughly the same size as the cross section of the tube piece 1 and disposed in direct continuation of the latter. in FIG. 1 an extreme position for the part 3 has been indicated by dotted lines, while the part 2 is shown in a position in which it has been turned inwards at an equally large angle.

In this case, the two parts also form a tubelike piece of constant rectangular cross section, but the axial direction has been changed, so that a corresponding variation in the direction of discharge is achieved. The direction of discharge can thus be adjusted optionally within this extreme position and the extreme position symmetrical therewith to the opposite side.

Simultaneously there may, however, independently of this be performed a throttling operation by the two parts from an optional parallel position being turned towards each other, so that the discharge area is narrowed. It is thus possible within certain limits to achieve mutually independent adjustments of the direction of discharge and the throttling.

The limits to the throttling are, however, not independent of the direction of discharge, it being impossible for one of the parts 2 and 3 to be turned farther inwards than to the position in which its rectangular portion engages the circular sectorshaped portions of the other part. This means that a to all intents and purposes complete closing can only occur when the direction of discharge is parallel to the axis of the tube piece 1, while at the maximum change of direction of the discharge there is no possibility of throttling. in practice, this is of no consequence, however, as in the case of heavy throttling the direction of discharge is of slight importance and the maximum limit to the change of the direction of discharge may, if the occasion should arise, be increased by the radius of the circular sector-shaped portions being reduced in relation to the distance between the centres of the two parts.

The two sides 8 of the rectangular tube piece 1, which sides 8 are parallel to the circular sector-shaped portions 4 and 5, are extended outwards with triangular portions 9 projecting slightly outside the circular edges of the portions 4 and 5, outside which there have in each of the portions been fitted a screw 10 with a nut 11 and washer 12 which, as the washer 12 projects over the circular sector-shaped portions 4 and 5, can serve for securing the said portions in an adjusted position. These triangular portions 9 at the same time serve for covering the zones in which the circular sector-shaped portions 4 and 5 do not overlap at their internal edges.

The rectangular tube piece 1 can be secured to the mouth of a ventilation duct, but may also directly form the latter, the circular sector-shaped portions 4 and 5 being in this case accommodated directly in the mouth by means of the rivets 6.

The said construction is, whether the tube piece 1 is designed separately or forms part of the mouth, particularly well suited for ventilation ducts terminating under the ceiling in a room to be ventilated, e.g. where such a duct terminates in a number of annularly disposed nozzles in a plane parallel to the ceiling and e.g. so as to be distributed with an angle between them of 30. When each of these mouths is provided with a nozzle like that referred to, it is possible to adjust the individual nozzles individually, it being possible to direct them e.g. slightly upwards towards or downwards from the ceiling and, if the occasion should arise, to throttle them suitably.

lclaim:

1. A nozzle for controlling the flow and direction of air from duct comprising:

a flow through housing having a singular outlet adapted to be positioned at the exit of an air duct;

locking means supported by the flow through housing;

a first member having a base and two sides; pivotally connected to one side of the flow through housing adjacent the outlet; and

a second member having a base and two sides pivotally connected to the opposite side of the flow through housing adjacent the outlet; the sides of the first and second member capable of overlapping; the locking means holding the position of the first and second member relative to 3. A nozzle as claimed in claim 1, where the sides of the first and second member are substantially circular segments with their pivot points being approximately at the centers of their circles. 

